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[Ilya Murav'jov <muravjov.il@xxxxxxxxx>]

I've investigated a lot and found out that it is an ACPI issue, IMHO.

After more installing and purging packages I found out that two packages "breaks" the system: acpi-support and upower.
If I uninstall them then I have no IO issues.

The new workaround without uninstalling packages:
- disable /etc/init.d/acpi-support script: just remove executable flag, 
     sudo chmod a-x /etc/init.d/acpi-support script
- disable UPower daemon: 
     cd /usr/share/dbus-1/system-services
     sudo mv org.freedesktop.UPower.no_service org.freedesktop.UPower.no_service
- then reboot (because if you have the IO issue already then reboot helps only)

After that you don't use suspend to RAM or you have the IO issue after
wakeup.

Just now I have 135 Mb/s for SATA SSD and 120 Mb/s for SATA HDD, in
13.04, i386. It is not perfect (under some amd64 Ubuntu I have 370 Mb/s
for the same SSD while his max speed is 340 Mb/s) but much better.

Any ideas? I'm ready to test and hack linux. :)

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1264707

Title:
  IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I recently installed a new motherboard Asus M5A99FX PRO R2.0 and found out that IO speed is very low; i.e.  the dd command output:
  dd if=/dev/zero of=/tmp/output bs=8k count=1000k
  ^C13885+0 records in
  13885+0 records out
  113745920 bytes (114 MB) copied, 99.6639 s, 1.1 MB/s

  This issue is reproducing with my new SSD (with ext4), my USB drives
  and my hard disk (with ext4) from Ubuntu i386, 13.04 and 13.10. Such a
  speed is not ok, awfully slow. When I run two or more the same dd
  commands simultaneously,  I have 1,2 Mb/s for every process.

  WORKAROUND: Use the amd64 version.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     4507 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  Date: Sat Dec 28 15:56:33 2013
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/10/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1708
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A99FX PRO R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1708:bd04/10/2013:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A99FXPROR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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